systems Tailored tanks built for seamless OEM integration

We design and manufacture custom stainless steel water tanks — including buffer tanks, indirect water heaters and chilled water tanks — fully tailored to your market or system requirements.

From geometry and heat exchange performance to connections and insulation

Every tank is engineered for optimal integration into HVAC, heat pump and hot water systems.

Our OEM tank manufacturing approach allows you to scale from prototype to high-volume production without redesign.

Our stainless steel tanks are used in demanding applications where durability, corrosion resistance and consistent performance are critical.

All parameters are fully customizable to ensure optimal performance in your specific application

Our approach to OEM tank manufacturing provides full flexibility without compromising production efficiency, repeatability or quality.

Laser welding, stainless-only production,
and a minimized number of tack welds ensure
industry-leading quality and corrosion resistance.

Custom tank dimensions for every application

Our production system supports a wide range of stainless steel buffer tanks and indirect water heaters — enabling precise adaptation to system requirements and available installation space.

Tank capacity range

25–1800 l

Application-specific heat exchanger

Diameter, Height, and Volume Range

Coil parameters can be precisely tailored to meet your thermal performance targets. We support a variety of geometries and configurations — including dedicated coil zones for electric heaters when required.

We design coil configurations to meet the required thermal performance of your system — whether for indirect water heaters, heat pump buffer tanks or HVAC water tanks.

Depending on the application, tanks can be manufactured as buffer tanks without coils, with a single internal coil, or with a dual-coil configuration

Coil shapes

Cylindrical, conical or hourglass

Coil diameter range

16–42 mm

Adjustable coil spacing

Optimized for performance and efficiency

Optimized for performance
and efficiency

Flexible nozzle configuration for system integration

NOzzles Exactly Where Your System Needs It

All nozzles are positioned according to your system layout — ensuring optimal flow, easy installation and seamless integration into OEM products. Connections can be placed on the shell, top or bottom heads, depending on design requirements.

Nozzles can be positioned freely on the shell or on the top / bottom heads, giving you full flexibility in port layout, routing, and installation orientation.

This allows precise alignment with hydraulic схемatics and simplifies system assembly and servicing.

Nozzles can be positioned freely on the shell or on the top / bottom heads, giving you full flexibility in port layout, routing, and installation orientation.

High-performance insulation for energy efficiency

Diameter, Height, and Volume Range

We apply PUR foam insulation to ensure low heat loss and compliance with energy efficiency requirements for hot water storage tanks and HVAC systems. Encased in a durable outer jacket for long-term performance and clean finish. Optimized insulation improves thermal efficiency, reduces energy losses and supports compliance with modern system standards.

PUR foam thicknesses

50/75/100 mmm

Custom stainless steel tanks for HVAC, heating and energy systems

ACT designs and manufactures stainless steel water tanks for a wide range of applications, including HVAC systems, heat pumps and domestic hot water installations.

Our portfolio includes stainless steel buffer tanks, indirect water heaters and chilled water tanks — all developed in the OEM model and tailored to your system requirements.

We also deliver custom stainless steel pressure tanks designed for specific performance, durability and integration needs. Each tank is engineered individually to ensure optimal thermal performance, system compatibility and long-term reliability.